Primary cosmic ray mass composition above 1 PeV as measured by the PRISMA-YBJ array
Y. Stenkin*, V.V. Alekseenko, S.W. Cui, Y.Y. He, B.B. Li, X.H. Ma, O.B. Shchegolev, V.I. Stepanov, Y.V. Yanin and J.J. Zhao
August 16, 2017
August 03, 2018
Primary cosmic ray mass composition above 1 PeV has been measured with PRISMA-YBJ being a prototype of PRISMA array at altitude of 4300 m a.s.l. It realized a novel type of EAS recording method measuring hadronic EAS component over the total array area through thermal neutron detection with a specially developed so-called en-detectors sensitive to electron and thermal neutron EAS components. Primary c. r. mass composition was recovered through measurements of two EAS components with the en-detectors: electromagnetic (energy deposit) and the number of secondary thermal neutrons produced locally by high energy hadrons. Monte-Carlo simulations of the experiments allowed us to find a parameter highly sensitive to the primary particle mass (atomic number) A above 1 PeV. The preliminary obtained mass composition is consistent with light composition and does not show any significant change at higher energies.
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